Category Archives: economy

　　Bolt looseness is common, but if you don’t pay attention, it will often cause equipment vibration, component damage, and even casualties. How to tighten a small nut has always been a long-lasting topic in mechanical design. Today, let’s talk about the most basic method of fixing nuts in work.It is strictly required by such a standard, Auto parts Only with today’s development scale, can we have the proud momentum to crush our competitors. https://www.chinatianlong.com/

　　

　　In general, we analyze the bolt fracture from the following four aspects:

　　

　　First, the quality of bolts

　　

　　Second, the pre-tightening torque of bolts

　　

　　Third, the strength of bolts

　　

　　Fourthly, the fatigue strength of bolts.

　　

　　In fact, most cases of bolt fracture are caused by looseness, specifically, it is damaged due to looseness. Because the situation of bolt loosening and breaking is basically the same as that of fatigue fracture, finally, we can always find the reason from the fatigue strength. In fact, the fatigue strength is so great that we can’t imagine it, and the fatigue strength is not used at all in the use of bolts.

　　

　　01

　　

　　The bolt fracture is not due to the tensile strength of the bolt.

　　

　　Take a M20〜80 8.8-grade high-strength bolt as an example. Its weight is only 0.2kg, and its minimum tensile load is 20t, which is as high as 100,000 times its own weight. Under normal circumstances, we only use it to fasten 20kg parts, and only use one thousandth of its maximum capacity. Even under the action of other forces in the equipment, it is impossible to exceed 1,000 times the weight of the parts, so the tensile strength of threaded fasteners is sufficient and it is impossible to damage them because of insufficient strength of bolts.

　　

　　02

　　

　　The fracture of bolts is not due to the fatigue strength of bolts.

　　

　　Threaded fasteners can be loosened only 100 times in the transverse vibration loosening experiment, but they need to be vibrated repeatedly for one million times in the fatigue strength experiment. In other words, the threaded fastener is loose when using one ten thousandth of its fatigue strength, and we only use one ten thousandth of its great capacity, so the loosening of the threaded fastener is not due to the fatigue strength of the bolt.

　　

　　03

　　

　　The real reason for the damage of threaded fasteners is looseness.

　　

　　When the threaded fastener is loosened, it generates huge kinetic energy mv2, which directly acts on the fastener and equipment, causing the fastener to be damaged. After the fastener is damaged, the equipment cannot work in a normal state, further causing the equipment to be damaged.

　　

　　When the fastener is subjected to axial force, the thread is damaged and the bolt is pulled off.

　　

　　When the fastener is subjected to radial force, the bolt is cut and the bolt hole is oval.

　　

　　04

　　

　　Choosing thread locking mode with excellent locking effect is the fundamental solution to the problem.

　　

　　Take hydraulic hammer as an example. The weight of GT80 hydraulic hammer is 1.663 tons, and its side bolts are 7 sets of M42 bolts of grade 10.9. The tensile force of each bolt is 110 tons, and the pre-tightening force is half of the tensile force, and the pre-tightening force is as high as 300 to 400 tons. However, the bolt will break, and now it is ready to be changed to M48 bolt. The fundamental reason is that the bolt locking cannot be solved.

　　

　　When a bolt breaks, it is easy for people to conclude that the strength is not enough, so most of them adopt the method of increasing the strength grade of the bolt diameter. This method can increase the pre-tightening force of the bolt, and its friction force is also increased. Of course, the anti-loosening effect can also be improved, but this method is actually a non-professional method, and its investment is too large and its income is too small.

　　

　　In short, the bolt is: “If you don’t loosen it, it will break.”

　　

　　Cause analysis of bolt looseness

　　

　　The threaded connection is designed according to the self-locking condition: ψ ＋ρv, and the friction pair generated in the threaded pair makes the bolt self-lock to tighten the bolt, so the connection will not loosen automatically under static load. However, under impact, vibration, variable load and great temperature change, the friction force f of the screw pair will decrease or disappear instantly. If this phenomenon occurs repeatedly, the connecting bolt will gradually loosen. After the threaded fastener is loosened, the kinetic energy mv2 is generated, and the fastener subjected to axial force, the thread is destroyed and the bolt is pulled off. Fasteners subjected to radial force, bolts are cut and bolt holes are broken.

　　

　　Bolt locking principle: limit the relative motion between screw pairs or increase the difficulty of relative motion.

　　

　　Introduction of common anti-loosening methods

　　

　　There are three commonly used methods for locking bolts: friction locking, mechanical locking and permanent locking. Among them, mechanical locking and friction locking are called detachable locking, while permanent locking is called non-detachable locking.

　　

　　01

　　

　　Friction locking

　　

　　1. Spring gasket locking

　　

　　The anti-loosening principle of the spring washer is that after the spring washer is flattened, the spring washer will generate a continuous elastic force, so that the threaded connection pair between the nut and the bolt will maintain a friction force continuously and generate a resistance moment, thus preventing the nut from loosening. At the same time, the sharp corner at the opening of the spring washer is embedded into the surface of the bolt and the connected piece respectively, thus preventing the bolt from rotating relative to the connected piece.

　　

　　2. Lock the top nut (double nut)

　　

　　3. Self-locking nut locking

　　

　　One end of the nut is made into a non-circular convergent or radially convergent after being slit. When the nut is tightened, the closure expands, and the screwing threads are pressed by the elastic force of the closure.

　　

　　4. Locking of elastic ring nut

　　

　　Fiber or nylon is embedded in the thread to increase friction. The elastic ring also plays a role in preventing liquid leakage.

　　

　　02

　　

　　Mechanical locking

　　

　　Locking of groove nut and cotter pin

　　

　　2. Stop gasket

　　

　　After the nut is tightened, the single-ear or double-ear stop washer is bent and attached to the side of the nut and the connected part respectively to realize locking.

　　

　　3. Locking of series steel wire

　　

　　Use low-carbon steel wire to penetrate the holes in the head of each screw, and connect the screws in series to brake each other.

　　

　　03

　　

　　Permanent locking

　　

　　Commonly used permanent locking are: spot welding, riveting, bonding, etc. This method mostly destroys threaded fasteners during disassembly and cannot be reused.

　　

　　In addition, there are other ways to prevent loosening, such as: coating liquid adhesive between screwing threads, embedding nylon rings at the end of nuts, riveting and locking. Mechanical locking and friction locking are called detachable locking, while permanent locking is called non-detachable locking.

　　

　　1, punching method to prevent loose

　　

　　After the nut is tightened, the thread is damaged at the end of the thread.

　　

　　2. Adhesive Locking-Nut Locking Solution

　　

　　Apply the nut locking liquid to the bolt tightening position, and then screw on the nut. After self-curing, the locking effect is good.

　　After more than a year of repeated tests and cooperation with seven other collaborators, the high-performance steel team of Shanghai University School of Materials successfully developed the world’s first 19.8-grade ultra-high-strength bolt known as the world’s strongest fastener.However, in other words, we should know more about it. Auto parts The law of development has brought new vitality to the whole industry and revitalized the market. https://www.chinatianlong.com/

　　

　　Through the optimization of materials and heat treatment process, the tensile strength of 16.8 and 19.8 grade bolts at room temperature meets 1600~1770MPa and 1900~2070MPa respectively.

　　

　　The results of shear test (according to GJB 3376-1998) show that the shear force of grade 16.8 and grade 19.8 bolts reaches 97KN and 115KN respectively.

　　

　　The tensile fatigue strength test at room temperature (according to GJB 3376-1998 and GJB715.30A-2002, the load ratio =0.1) shows that the developed fastener meets the fatigue life requirements (the average fatigue life is not less than 65,000 times, and the single fatigue life is not less than 45,000 times).

　　

　　The results of delayed fracture resistance test (according to GJB 715.12-1990, the constant tensile stress was kept for 96 hours in atmospheric environment) showed that the bolt did not break during the test time, and no cracks were found on the bolt surface and thread after unloading. The comprehensive performance of the newly developed ultra-high strength bolt meets the service requirements.

　　

　　Class 16.8 and 19.8 fasteners in kind (specifications are MJ8〜1〜50)

　　

　　Under the same clamping force, the ultra-high strength fastener can reduce its weight and increase the installation space by reducing its own size, so it can optimize the function and volume of the connected parts, so as to achieve the goal of overall weight reduction and performance optimization of the equipment.

　　

　　So what is a high strength bolt? What is the strength of high-strength bolts? Sister Jin brought you here today to find out.

　　

　　one

　　

　　What is a high strength bolt?

　　

　　High-Strength Friction Grip Bolt, literally translated as: high-strength friction preload bolt, abbreviated as HSFG. It can be seen that the high-strength bolt mentioned in Chinese construction is the abbreviation of high-strength friction pre-tightening bolt. In daily communication, only the words “Friction” and “Grip” are briefly mentioned, but it has caused many engineers and technicians to understand the basic definition of high-strength bolts, resulting in misunderstandings.

　　

　　Myth 1:

　　

　　Bolts with material grade over 8.8 are “high strength bolts”?

　　

　　The core difference between high-strength bolts and ordinary bolts is not the strength of the materials used, but the form of stress. The essence is whether to apply pre-tightening force and use static friction to resist shear.

　　

　　In fact, there are only two kinds of high-strength bolts (HSFG BOLT) mentioned in British Standard Specification and American Standard Specification (BS EN 14399/ASTM-A325&ASTM-490), while ordinary bolts include 4.6, 5.6, 8.8, 10.9, 12.9, etc. (BS 3692 11, Table 2) It can be seen that the strength of materials is not the key to distinguish high-strength bolts from ordinary bolts.

　　

　　2?

　　

　　Where is the strength of high-strength bolts?

　　

　　According to GB50017, calculate the tensile and shear strength of a single ordinary bolt (Class B) with Grade 8.8 and a high-strength bolt with Grade 8.8.

　　

　　Through calculation, we can see that the design values of tensile strength and shear strength of ordinary bolts are higher than those of high-strength bolts under the same grade.

　　

　　So where is the “strength” of high-strength bolts?

　　

　　In order to answer this question, it is necessary to study the law of elastic-plastic deformation of two kinds of bolts from the design working state, and understand the limit state of design failure.

　　

　　Stress-strain curves of ordinary bolts and high-strength bolts under working conditions

　　

　　Limit state of design failure

　　

　　Ordinary bolt: the screw itself has plastic deformation exceeding the design allowable, and the screw is sheared.

　　

　　For ordinary bolted connections, there will be relative slip between the connecting plates before they begin to bear shear force, and then the bolt rod will contact with the connecting plates, which will cause elastic-plastic deformation and bear shear force.

　　

　　High-strength bolt: The static friction between the effective friction surfaces is overcome, and the two steel plates are relatively displaced, which is considered as failure in design.

　　

　　When high-strength bolts are connected, the friction bears the shear force first. When the load increases to the point where the friction force is not enough to resist the shear force, the static friction force is overcome and the connecting plates slide relatively (limit state). However, although it is damaged at this time, the bolt rod is in contact with the connecting plate, and it can still bear the shear force by using its own elastic-plastic deformation.

　　

　　Myth 2:

　　

　　High bearing capacity is high strength bolt?

　　

　　From the calculation of a single bolt, it can be seen that the design strength of high-strength bolt in tension and shear is lower than that of ordinary bolt. The essence of its high strength is that during normal operation, the joint is not allowed to slip, that is, the elastic-plastic deformation is small and the joint stiffness is large.

　　

　　It can be seen that the joints designed with high-strength bolts may not necessarily save the number of bolts under the given design node load, but they have small deformation, high stiffness and high safety reserve. It is suitable for the main beam, and other positions that require greater joint stiffness, which conforms to the basic seismic design principle of “strong joints and weak members”.

　　

　　The strength of high-strength bolts lies not in the design value of their own bearing capacity, but in the high stiffness, high safety and strong damage resistance of their designed joints.

　　

　　three

　　

　　Comparison between high strength bolts and ordinary bolts

　　

　　Ordinary bolts and high-strength bolts have great differences in construction inspection methods because of their different design stress principles.

　　

　　The mechanical performance requirements of ordinary bolts of the same grade are slightly higher than those of high-strength bolts, but high-strength bolts have one more acceptance requirement for impact work than ordinary bolts.

　　

　　The marking of ordinary bolts and high-strength bolts is the basic method to identify bolts of the same grade on site. Because the values of torque calculation for high-strength bolts in British and American standards are different, it is necessary to identify the bolts of the two standards.

　　

　　Ordinary bolts are about 70% of the price of high-strength bolts. Combined with the comparison of their acceptance requirements, it can be concluded that the premium part should be to ensure the impact energy (toughness) performance of materials.

　　In modern industrial production, liquid filtration is a crucial step. The performance and quality of filters directly affect production efficiency and product quality. In order to meet the needs of different industries for efficient, durable, and easy to maintain filters, C has launched a professional, efficient, and one-piece filter – the RYF series filter. This is an innovative filtration solution that ensures efficient filtration while featuring a unique integrated design, making installation and maintenance exceptionally easy.The industry believes that, chemical pump The development of our company marks the rapid and steady progress of the whole industry. http://www.luoyuan108.com/

　　

　　Product Introduction

　　

　　The RYF series integrated molding filter is an efficient filtration equipment designed by our company for liquid filtration needs in industrial production processes. This device adopts the design concept of integrated molding, with a compact structure, small size, and easy installation and maintenance. At the same time, the product has a simple and elegant appearance, which can adapt to various production environments.

　　

　　Product features and advantages

　　

　　1. The RYF series one-piece filter has a simple and elegant structure, consisting of a main body, a mesh belt, and an upper cover. The main filtering chamber, inlet and outlet flanges, and upper end flange are all made of high-quality plastic material, which is integrated through advanced injection molding technology to form a sturdy and leak free sealing structure.

　　

　　2. The flange bolt hole spacing of the filter is flexible and versatile, and can easily match with national, American, Japanese, and German standard flanges, demonstrating high compatibility and wide applicability. The unique square base design not only enhances the safety and stability of the filter, but also enables it to be easily fixed in different scenarios.

　　

　　3. It is worth noting that the four hole installation method of the square base cleverly raises the bottom, making it convenient for users to clean and discharge the inside of the filter and the filter medium. This clever idea not only reflects the designer’s humanized consideration, but also enhances the overall practicality of the filter.

　　

　　4. The RYF series integrated filter is made of special materials, including high-quality plastics such as PVDF, PPH, PPR, etc., which enable it to withstand high temperature and high concentration strong acid and alkali environments, and even meet the filtration needs of most chemical liquids. This makes this filter have a wide range of application prospects in industries such as chemical, pharmaceutical, food, and environmental protection.

　　

　　Product model and parameters

　　

　　1. Model number: RYF series integrated filter.

　　

　　2. The filtration area ranges from 0.12-0.5m 2, which can meet the filtration needs of different scales. The flow range is between 12-40m 3/h, which can efficiently and quickly filter a large amount of liquid.

　　

　　3. The material adopts advanced plastic materials PPH, PVDF, and PPR, which not only resist corrosion and high temperature, but also resist the erosion of most chemical liquids, ensuring the stability and long life of the filter.

　　

　　4. The temperature range is between 70-90 ≧, allowing this filter to operate normally in a wide range of temperature environments, with strong adaptability and high reliability.

　　

　　Application industry

　　

　　The RYF series integrated filter has the characteristics of simple structure, safe sealing, easy cleaning and discharge, special material, high temperature and high pressure resistance, and corrosion resistance. These characteristics make the filter widely used in the chemical, pharmaceutical, food, environmental protection, and electroplating industries.

　　

　　In the pharmaceutical industry, the RYF series filters are capable of filtering various corrosive drugs and organic solvents. This not only removes impurities and foreign substances, ensuring the purity and safety of the drug, but also has high efficiency in filtering most chemical solutions.

　　

　　In the food industry, the RYF series integrated filters also play an important role. It can filter impurities and foreign substances in various food ingredients such as beverages and alcoholic beverages, ensuring the quality and safety of the products.

　　

　　In the environmental protection industry, the application of RYF series filters can filter impurities such as suspended solids and organic matter in water, ensuring the safety and purity of water quality. This is of great significance for the field of environmental water treatment.

　　

　　In the electroplating industry, the role of RYF series integrated filters cannot be underestimated. During the electroplating process, various waste liquids and wastewater are generated, which require strict filtration and treatment to avoid affecting the environment and production equipment. The RYF series filters can effectively filter and treat these waste liquids and wastewater, ensuring the stability and sustainability of electroplating production.

　　

　　In short, the RYF series one-piece filter is undoubtedly an efficient, durable, and easy to maintain filtering device. It is widely used in industries such as chemical, pharmaceutical, food, and environmental protection to safeguard your production. Choosing our products can not only help you improve production efficiency and reduce costs, but also enhance your business’s competitiveness in the market. If you have any questions or need more information about our products, please feel free to contact us at any time. We will serve you wholeheartedly! At the same time, please follow our official account for more product information and industry information.

　　Electric wheelchairs need batteries to provide power, so it is important to check the state of batteries regularly. Both lead-acid batteries and lithium batteries have limited service life. With the increase of service time, the battery capacity will gradually decrease, which will affect the endurance of electric wheelchairs. It is generally recommended to check the battery performance every 1.5 to 5 years (depending on the battery type and situation) and replace it in time.Today, people are interested in 電動輪椅 There are also many dependencies, and the expectations for products are getting higher and higher. https://www.hohomedical.com/collections/light-weight-wheelchair

　　

　　02

　　

　　tyre

　　

　　Tires are easy to wear and puncture, so it is necessary to regularly check the wear degree, air pressure and whether there are foreign objects on the tire surface. Damaged or aged tires need to be replaced in time.

　　

　　03

　　

　　Brake system

　　

　　Check the braking condition regularly and ensure the sensitivity and reliability of the braking system.

　　

　　04

　　

　　Motor and drive system

　　

　　Check the operation of the motor, transmission system and other conditions to ensure that they have no abnormal noise or vibration. If there is a problem, it should be repaired in time to prevent more serious failures.

　　

　　05

　　

　　Joystick and control system

　　

　　Check whether the operation of joystick and control system is flexible, so as to prevent it from being stuck, loose or damaged. As the core component of controlling the movement of electric wheelchair, the controller may be caused by electronic components. Failure due to aging, humidity or impact. Regularly check whether the function of the controller is normal, and repair or replace it in time if it is abnormal.

　　

　　06

　　

　　charger

　　

　　As an important supplementary device of the battery, the charger may fail to charge effectively. Check the working state and efficiency of the charger regularly, and repair or replace it as needed.

　　The English word for Screw is screw. The meaning of this word has changed greatly in recent hundreds of years. At least in 1725, it means “mating”.According to related reports, hardlock nut To a large extent, it leads the changes of market conditions. https://www.chinatianlong.com/

　　

　　The application of the thread principle can be traced back to 220 BC, when the Greek scholar Archimedes created the spiral water lifting tool.

　　

　　In the 4th century A.D., Mediterranean countries began to apply the principle of bolts and nuts to the press for wine making. At that time, the external threads were all wrapped around a cylindrical bar with a rope, and then carved according to this mark, while the internal threads were often formed by hammering with soft materials wrapped around the external threads.

　　

　　Around 1500, in the sketch of thread processing device drawn by Italian Leonardo da Vinci, there was an idea of using mother screw and exchange gear to process threads with different pitches. Since then, the method of mechanical thread cutting has developed in European watch manufacturing industry.

　　

　　In 1760, the British brothers J. Wyatt and W. Wyatt obtained a patent for cutting wooden screws with a special device. In 1778, an Englishman, J. ramsden, made a thread cutting device driven by a worm gear pair, which could process long threads with high precision. In 1797, H. Maudslay, an Englishman, turned metal threads with different pitches on the lathe improved by him, which laid the basic method for turning threads.

　　

　　In the 1820s, Maudslay produced the first batch of taps and dies for thread processing.

　　

　　At the beginning of the 20th century, the development of automobile industry further promoted the standardization of threads and the development of various precise and efficient thread processing methods. Various automatic opening die heads and automatic shrinking taps were invented one after another, and thread milling began to be applied.

　　

　　In the early 1930s, thread grinding appeared.

　　

　　Although the thread rolling technology was patented in the early 19th century, it developed slowly because of the difficulty in mold manufacturing. It was not until the Second World War (1942 ~ 1945) that the demand of ammunition production and the development of thread grinding technology solved the precision problem of mold manufacturing, and it achieved rapid development.

　　

　　Threads are mainly divided into connection threads and transmission threads.

　　

　　For connecting threads, the main processing methods are tapping, threading, turning, rolling and rubbing.

　　

　　For transmission thread, its processing methods are mainly: rough turning-grinding, cyclone milling-rough turning, etc.

　　

　　Today, let’s take a look at the various processing methods of threads with Xiao Bang and see which method is better.

　　Wheelchairs are widely used in patients’ rehabilitation training and family life, such as lower limb dysfunction, hemiplegia, paraplegia below the chest and people with mobility difficulties. As patients’ families and rehabilitation therapists, it is very necessary to know the characteristics of wheelchairs, choose the most suitable wheelchairs and use them correctly.For these reasons, I think 電動輪椅 The situation is still optimistic, and the market is still in a blue ocean stage. https://www.hohomedical.com/collections/light-weight-wheelchair

　　

　　First of all, what harm will an inappropriate wheelchair do to the user?

　　

　　Excessive local compression

　　

　　Form a bad posture

　　

　　Induced scoliosis

　　

　　Causing contracture of joints

　　

　　(What are the unsuitable wheelchairs: the seat is too shallow and the height is not enough; The seat is too wide and the height is not enough)

　　

　　The main parts that wheelchair users bear pressure are ischial tubercle, thigh, popliteal fossa and scapula. Therefore, when choosing a wheelchair, we should pay attention to whether the size of these parts is appropriate to avoid skin wear, abrasions and pressure sores.

　　

　　Let’s talk about the choice of wheelchair, which must be kept in mind!

　　

　　Choice of ordinary wheelchair

　　

　　Seat width

　　

　　Measure the distance between two hips or between two legs when sitting down, and add 5cm, that is, there is a gap of 2.5cm on each side after sitting down. The seat is too narrow, it is difficult to get on and off the wheelchair, and the hip and thigh tissues are compressed; The seat is too wide, it is difficult to sit still, it is inconvenient to operate the wheelchair, the upper limbs are easy to get tired, and it is difficult to get in and out of the gate.

　　

　　Seat length

　　

　　Measure the horizontal distance from the hip to the gastrocnemius of the calf when sitting down, and reduce the measurement result by 6.5cm. The seat is too short, the weight mainly falls on the ischium, and the local pressure is easy to be too much; If the seat is too long, it will compress the popliteal fossa, affect the local blood circulation, and easily irritate the skin of this part. It is better to use a short seat for patients with extremely short thighs or flexion and contracture of hips and knees.

　　

　　Seat height

　　

　　Measure the distance from the heel (or heel) to the popliteal fossa when sitting down, and add 4cm. When placing the pedal, the board surface should be at least 5cm from the ground. The seat is too high for the wheelchair to enter the table; The seat is too low and the ischium bears too much weight.

　　

　　seating washer

　　

　　In order to be comfortable and prevent pressure sores, a seat cushion should be placed on the seat, and foam rubber (5~10cm thick) or gel cushion can be used. To prevent the seat from sinking, a piece of plywood with a thickness of 0.6cm can be placed under the seat cushion.

　　

　　Backrest height

　　

　　The higher the backrest, the more stable it is, and the lower the backrest, the greater the range of motion of the upper body and upper limbs. The so-called low backrest is to measure the distance from the seat surface to the armpit (one arm or two arms extend forward horizontally), and subtract 10cm from this result. High backrest: measure the actual height from the seat surface to the shoulder or back pillow.

　　

　　Handrail height

　　

　　When sitting down, the upper arm is vertical and the forearm is flat on the armrest. Measure the height from the chair surface to the lower edge of the forearm, and add 2.5cm. Proper armrest height helps to maintain correct posture and balance, and can make the upper limbs placed in a comfortable position. The armrest is too high, and the upper arm is forced to lift up, which is easy to fatigue. If the armrest is too low, you need to lean forward to maintain balance, which is not only easy to fatigue, but also may affect your breathing.

　　

　　Other auxiliary parts of wheelchair

　　

　　Designed to meet the special needs of patients, such as increasing the friction surface of the handle, extending the brake, anti-shock device, anti-skid device, armrest mounting arm rest, wheelchair table to facilitate patients to eat and write, etc.

　　With the continuous development of industrial technology, pump equipment plays an increasingly important role in industrial production. In the fields of chemical engineering, medicine, food, etc., pump equipment, as an important tool for conveying media, has a significant impact on production efficiency and quality. In recent years, with the strengthening of environmental awareness and the increasing demand for safety production, enterprises have become more strict in product selection. In the post pandemic era, the global economy is in a downturn, and business operations are facing even more severe challenges. How to reduce costs and increase efficiency, improve production efficiency and product quality has become an urgent problem for enterprises to solve. As one of the important transportation tools, the selection and optimization of pump equipment have also become an important way for enterprises to improve production efficiency and reduce costs.Only by working together can we turn chemical pump The value of the play out, the development of the supply market needs. http://www.luoyuan108.com/

　　

　　The KG series of coaxial acid alkali resistant pumps we have launched are carefully developed to meet the needs of enterprises. This pump has multiple unique design and technological advantages, which can reduce costs, improve production efficiency, and ensure production safety for chemical enterprises. Let’s learn about the features and advantages of this pump together.

　　

　　01 Product Features

　　

　　The KG series coaxial acid alkali resistant pump is a pump designed for the chemical industry, which has the following characteristics:

　　

　　1. Wide applicability: This pump can be applied to media with various chemical properties, and its applicable temperature is below 85 ≧ for FRPP and PVDF, depending on the different chemical properties. At the same time, choosing different pump body materials can resist strong acids and alkalis, as well as the chemical properties used in fluorination series.

　　

　　2. Unique shaft seal design: adopting Teflon Bellows Seal self cooling type, selecting shaft seal materials Sic, Carbon, Ceramic according to various chemical properties. Compared to other similar products, the shaft seal design of this pump is more unique, which can effectively ensure the service life and operational safety of the pump.

　　

　　3. The rear cover is a combination type: easy to assemble, with no cooling circulation circuit design, and cannot be used idle. The rear cover of the pump adopts a combination design, which is easy to assemble and does not require a cooling circulation circuit, ensuring the safe operation of the pump.

　　

　　4. Low noise: The pump is made of high-quality materials and exquisite craftsmanship, with advantages such as low noise and low vibration. It ensures stable operation of the pump while reducing noise interference during the production process.

　　

　　5. High reliability: The pump adopts advanced production technology and precise mechanical processing, and has undergone multiple rigorous tests and verifications to ensure the reliability and stability of the product.

　　

　　02 Product specifications and parameters

　　

　　03 Advantage Comparison

　　

　　Compared with traditional pumps, the advantages of KG series coaxial acid alkali resistant pumps are:

　　

　　Low noise and low vibration: Designed with advanced fluid analysis technology, the pump’s noise and vibration are minimized, ensuring a quiet and stable production site.

　　

　　Low energy consumption: The design and optimization of pumps can greatly reduce energy consumption, thereby saving energy costs.

　　

　　Long lifespan: The shaft seal of the pump adopts a Teflon Bellows Seal self cooling design, which can greatly extend the service life of the pump.

　　

　　No need for additional cooling circulation circuit: The rear cover of the pump is a combination type, easy to assemble, without a cooling circulation circuit design, and cannot be used idle, making the use of the pump more convenient and reliable.

　　

　　04 Application Fields

　　

　　The KG series coaxial acid alkali resistant pumps are widely used in industries such as chemical, pharmaceutical, electronics, and environmental protection for the transportation, filtration, and circulation of acid alkali liquids. For example:

　　

　　Chemical industry: In fields such as organic synthesis and hydrocarbon cracking, acid-base liquids are inevitable, which requires reliable acid-base pumps for transportation.

　　

　　Pharmaceutical industry: In the process of drug synthesis and formulation, a certain amount of acid-base liquid is required, and the role of acid-base pump is particularly important.

　　

　　Electronics industry: In the production of semiconductors, LCD displays, and other products, various corrosive and electroplating solutions are required. These liquids have strong corrosiveness and volatility, and high-quality corrosion-resistant pumps are needed. The FRPP and PVDF materials of KG series pumps can withstand the corrosion of these chemicals, and adopt a unique Teflon Bellows Seal self cooling shaft seal design, effectively avoiding the damage of chemical corrosion to the pump.

　　

　　Overall, the KG series coaxial acid alkali resistant pumps have the advantages of high efficiency, corrosion resistance, safety, and stability, and are widely used in various industries. Our company will continue to be committed to developing high-quality and efficient pumps, providing high-quality products and services for various industries.

　　The controller is the core component of the electric wheelchair, which can also be understood as the “steering wheel” to control the direction of the wheelchair, and is responsible for the operation of the linkage motor. Its quality directly determines the maneuverability and service life of the electric wheelchair, and the functions and performance of the controller equipped with different configurations of electric wheelchairs will be different. Advanced electric wheelchairs are usually equipped with intelligent control system, which can freely adjust the speed and direction according to the user’s habits and environment to provide a more comfortable driving experience (controllers can be divided into basic models/with folding function/with reclining function/multi-function buttons according to the operation panel) and other feedback functions of intelligent voice broadcast. However, the basic electric wheelchair usually has simple control function, and it is not equipped with the common functions of intelligent voice broadcast and mobile phone remote control adaptation. Individual manufacturers have also added usb-adapted mobile phone charging port and lighting lamp to the controller.precisely because 電動輪椅 The rapid development of, so also brought new opportunities to the industry. https://www.hohomedical.com/collections/light-weight-wheelchair

　　

　　Most imported brand controllers are composed of upper and lower controllers, while most domestic brands only have upper controllers. Generally, the brushless ones in China are generally divided into upper controller and lower controller, and most of the brushes have only upper controller. Among the imported controller brands, PG in Britain and Dynamic in New Zealand are widely used. Domestic brands include Wuyang and Shiyou, Shanghai Zhilian Aomang, Nuole, Maikong, Pilotage, etc. Comparatively speaking, imported brands are better, and the cost and price are higher than domestic brands. However, in recent years, the rise of domestic products can also meet the needs and experiences of most consumers. You can also use the following operations to judge whether the controller is good or bad.

　　

　　1. Turn on the power switch and push the controller to feel whether the vehicle is stable when starting; Release the controller and feel whether the car stops immediately after a sudden stop. It is advisable to judge whether the controller is normal by starting and stopping slightly.

　　

　　2. Control the rotating car to rotate 360 degrees in situ, and feel whether the steering is smooth and flexible, subject to the steering sensitivity.

　　Cold heading (extrusion) technology is a main processing technology in fastener forming process. Cold heading (extrusion) belongs to the field of metal pressure processing. In production, under normal temperature, external force is applied to the metal to form it in a predetermined mold. This method is usually called cold heading.Industry experts have said that, mining bolt It is very possible to develop and expand, which can be well seen from its previous data reports. https://www.chinatianlong.com/

　　

　　In fact, the forming of any fastener can not only be achieved by cold heading, but also accompanied by various deformation methods such as forward and backward extrusion, compound extrusion, punching and rolling in the process of cold heading.

　　

　　Therefore, the name of cold heading in production is just a habitual name, more precisely, it should be called cold heading (extrusion).

　　

　　Cold heading (extrusion) method is a kind of processing method with high comprehensive economic benefit, which is widely used in the fastener industry and is also an advanced processing method widely used at home and abroad.

　　

　　Therefore, how to make full use of and improve the plasticity of metal, master the mechanism of plastic deformation of metal, and develop a scientific and reasonable cold heading (extrusion) processing technology for fasteners is the purpose and purpose of this paper.

　　

　　First, the basic concept of metal deformation

　　

　　Deformation refers to the sum of the relative displacements of the tiny particles that make up the metal when it is stressed (external force and internal force) under the condition of maintaining its integrity.

　　

　　1 Types of deformation

　　

　　A. elastic deformation

　　

　　The ability of a metal to recover its original shape and size when the external force is removed is called elastic deformation.

　　

　　The quality of elasticity is measured by elastic limit and proportional limit.

　　

　　B. Plastic deformation

　　

　　Under the action of external force, a metal is permanently deformed (refers to the deformation that cannot be restored to its original state after removing external force), but the integrity of the metal itself will not be destroyed, which is called plastic deformation.

　　

　　The plasticity is expressed by elongation, area shrinkage and yield limit.

　　

　　2 evaluation method of plasticity

　　

　　The plasticity is expressed by elongation, area shrinkage and yield limit.

　　

　　In order to evaluate the plasticity of metals, a numerical index, called plasticity index, is often used.

　　

　　The plasticity index is expressed by the plastic deformation at the moment when the steel sample begins to fail. In production practice, the following methods are usually used:

　　

　　(1) Tensile test

　　

　　The tensile test is expressed by elongation δ and area shrinkage ψ. It indicates the plastic deformation ability of steel samples under uniaxial tension, which is a common plastic index in metal material standards. The values of δ and ψ are determined by the following formula:

　　

　　Where: L0, lk-the length of the original gauge of the tensile specimen and the gauge after failure.

　　

　　F0, Fk！！ the cross-sectional area of the original and broken parts of the tensile specimen.

　　

　　(2) Upsetting test is also called flattening test.

　　

　　It is to make the sample into a cylindrical shape with the height Ho 1.5 times of the original diameter Do of the sample, and then flatten it on a press until the first visible crack appears on the surface of the sample. At this time, the compression degree εc is the plastic index. Its value can be calculated by pressing the following formula:

　　

　　Where Ho！！ is the original height of the cylindrical sample. Hk！！ the height of the sample when the first visible crack appears on the side surface during flattening.

　　

　　The torsion test is expressed by the torsion angle or the number of torsion turns when the sample is twisted on the twisting machine. Tensile test and upsetting test are commonly used in production.

　　

　　No matter which test method, it is relative to a specific stress state and deformation condition.

　　

　　The plasticity index obtained from this is only a relative comparison, which only shows the plasticity of a certain metal under what deformation conditions.

　　

　　3 Main factors affecting metal plasticity and deformation resistance

　　

　　The concept of metal plasticity and deformation resistance: metal plasticity can be understood as the ability of metal to change its shape stably without destroying the connection between particles under the action of external force. And the force that the metal reacts to the tool and die when it is deformed is called deformation resistance.

　　

　　The main factors affecting metal plasticity and deformation resistance include the following aspects:

　　

　　A. Influence of metal structure and chemical composition on plasticity and deformation resistance

　　

　　The metal structure depends on the chemical composition of the metal, the lattice type of its main elements, and the nature, quantity and distribution of impurities. The fewer constituent elements, the better the plasticity.

　　

　　For example, pure iron has high plasticity.

　　

　　Carbon in iron is a solid melt and has good plasticity, while it is a compound, so its plasticity decreases.

　　

　　For example, the compound Fe3C is actually very brittle. Generally, the increase of other elements in steel will also reduce the plasticity of steel.

　　

　　With the increase of carbon content in steel, the resistance indexes (бb, бp, бs, etc.) of steel all increase, while the plasticity indexes (ε, ψ, etc.) all decrease. When the carbon content in steel is increased by 0.1% during cold deformation, its strength limit бs is increased by about 6 ~ 8 kg/mm2.

　　

　　Sulfur exists in steel as iron sulfide and manganese sulfide. Iron sulfide is brittle, and manganese sulfide is elongated in the process of pressure processing, thus reducing the mechanical index in the transverse direction perpendicular to the fiber. So sulfur is a harmful impurity in steel, and the less the content, the better.

　　

　　Phosphorus in steel improves deformation resistance and reduces plasticity. Steel with phosphorus content higher than 0.1% ~ 0.2% has cold brittleness. Generally, the phosphorus content of steel is controlled at 0.00%. The distribution of other impurities such as low melting point in metal matrix has great influence on plasticity.

　　

　　In a word, the more complex the chemical composition in steel is, the more the content is, and the greater the influence on the resistance and plasticity of steel is. This explains why some high alloy steels are difficult to be cold heading (pressing).

　　

　　B. Effect of deformation speed on plasticity and deformation resistance

　　

　　Deformation velocity is the relative displacement volume per unit time:

　　

　　The deformation speed should not be confused with the movement speed of the deformation tool, but should also be conceptually distinguished from the movement speed of particles in the deformation body.

　　

　　Generally speaking, with the increase of deformation speed, deformation resistance increases and plasticity decreases.

　　

　　In cold deformation, the influence of deformation speed is not as significant as that in hot deformation, which is due to the absence of hardening elimination process.

　　

　　However, when the deformation speed is particularly high, the heat generated by plastic deformation (that is, thermal effect) must not be separated. Increasing the temperature itself will improve plasticity and reduce deformation resistance.

　　

　　C. the influence of stress state on plasticity and deformation resistance

　　

　　Under the action of external force, internal force is generated in the metal, and its strength per unit area is called stress. The stressed metal is under stress.

　　

　　A tiny elementary cube is separated from the deformed body, and the stress with unknown magnitude but known direction acts on the cube. This diagram representing the number and symbol of principal stresses at points is called principal stress diagram.

　　

　　There are nine principal stress diagrams representing the stress state of metals, four of which are three-way principal stress diagrams, three are plane principal stress diagrams and two are unidirectional principal stress diagrams, as shown in Figure 36-1.

　　

　　Principal stress caused by tensile stress is positive sign, and principal stress caused by compressive stress is negative sign.

　　

　　In metal pressure machining, the three-dimensional principal stress diagrams with the same sign and different sign are often encountered. Among the three-dimensional principal stress diagrams with different signs, the principal stress diagram with two compressive stresses and one tensile stress is the most common.

　　

　　In the triaxial stress diagram with the same sign, when the compressive stresses in all directions are equal (б1=б2=б3), and there are no porosity and other defects in the metal, theoretically, plastic deformation cannot occur, only elastic deformation occurs.

　　

　　Unequal triaxial compressive stress diagrams include deformation processes such as volume die forging, upsetting, closed punching, positive and negative extrusion, plate and profile rolling, etc.

　　

　　In the actual production, the triaxial tensile stress diagram is rarely encountered. Only in the tensile test, when necking occurs, the stress line at the necking is the principal stress diagram of triaxial tensile, as shown in Figure 36-2.

　　

　　During upsetting, due to the action of friction, it also presents a three-dimensional compressive stress diagram, as shown in Figure 36-3.

　　

　　In a word, in the stress state of stressed metal, compressive stress is beneficial to the increase of plasticity, while tensile stress will reduce the plasticity of metal.

　　

　　During upsetting, due to the action of friction, it also presents a three-dimensional compressive stress diagram, as shown in Figure 36-3.

　　

　　In a word, in the stress state of stressed metal, compressive stress is beneficial to the increase of plasticity, while tensile stress will reduce the plasticity of metal.

　　

　　D. influence of cold deformation hardening on metal plasticity and deformation resistance

　　

　　The mechanical properties, physical properties and chemical properties of metals are changed after cold plastic deformation.

　　

　　With the increase of deformation degree, all strength indexes (elastic limit, proportional limit, flow limit and strength limit) are improved, and the hardness is also improved. Plastic indexes (elongation, area shrinkage and impact toughness) are decreased; Resistance increases; Corrosion resistance and thermal conductivity are reduced, and the magnetic properties of metals are changed. In plastic deformation, the sum of these properties changes of metals is called cold deformation hardening, or hardening for short.

　　

　　E. the influence of additional stress and residual stress

　　

　　In deformed metal, the stress distribution is uneven, and it is hoped to obtain larger deformation where the stress distribution is more, and smaller deformation where the stress distribution is less.

　　

　　Because of the integrity of the deformed metal itself, there are internal forces that are balanced with each other, that is, the so-called additional stress. When the deformation is terminated, these mutually balanced stresses exist in the deformed body, which constitutes residual stress and affects the plasticity and deformation resistance of the deformed metal in the later deformation process.

　　In modern industrial production, liquid filtration is a crucial step. The performance and quality of filters directly affect production efficiency and product quality. In order to meet the needs of different industries for efficient, durable, and easy to maintain filters, C has launched a professional, efficient, and one-piece filter – the RYF series filter. This is an innovative filtration solution that ensures efficient filtration while featuring a unique integrated design, making installation and maintenance exceptionally easy.For this reason, it can be speculated that Chemical filter The market feedback will get better and better, which is one of the important reasons why it can develop. http://www.luoyuan108.com/

　　

　　Product Introduction

　　

　　The RYF series integrated molding filter is an efficient filtration equipment designed by our company for liquid filtration needs in industrial production processes. This device adopts the design concept of integrated molding, with a compact structure, small size, and easy installation and maintenance. At the same time, the product has a simple and elegant appearance, which can adapt to various production environments.

　　

　　Product features and advantages

　　

　　1. The RYF series one-piece filter has a simple and elegant structure, consisting of a main body, a mesh belt, and an upper cover. The main filtering chamber, inlet and outlet flanges, and upper end flange are all made of high-quality plastic material, which is integrated through advanced injection molding technology to form a sturdy and leak free sealing structure.

　　

　　2. The flange bolt hole spacing of the filter is flexible and versatile, and can easily match with national, American, Japanese, and German standard flanges, demonstrating high compatibility and wide applicability. The unique square base design not only enhances the safety and stability of the filter, but also enables it to be easily fixed in different scenarios.

　　

　　3. It is worth noting that the four hole installation method of the square base cleverly raises the bottom, making it convenient for users to clean and discharge the inside of the filter and the filter medium. This clever idea not only reflects the designer’s humanized consideration, but also enhances the overall practicality of the filter.

　　

　　4. The RYF series integrated filter is made of special materials, including high-quality plastics such as PVDF, PPH, PPR, etc., which enable it to withstand high temperature and high concentration strong acid and alkali environments, and even meet the filtration needs of most chemical liquids. This makes this filter have a wide range of application prospects in industries such as chemical, pharmaceutical, food, and environmental protection.

　　

　　Product model and parameters

　　

　　1. Model number: RYF series integrated filter.

　　

　　2. The filtration area ranges from 0.12-0.5m 2, which can meet the filtration needs of different scales. The flow range is between 12-40m 3/h, which can efficiently and quickly filter a large amount of liquid.

　　

　　3. The material adopts advanced plastic materials PPH, PVDF, and PPR, which not only resist corrosion and high temperature, but also resist the erosion of most chemical liquids, ensuring the stability and long life of the filter.

　　

　　4. The temperature range is between 70-90 ≧, allowing this filter to operate normally in a wide range of temperature environments, with strong adaptability and high reliability.

　　

　　Application industry

　　

　　The RYF series integrated filter has the characteristics of simple structure, safe sealing, easy cleaning and discharge, special material, high temperature and high pressure resistance, and corrosion resistance. These characteristics make the filter widely used in the chemical, pharmaceutical, food, environmental protection, and electroplating industries.

　　

　　In the pharmaceutical industry, the RYF series filters are capable of filtering various corrosive drugs and organic solvents. This not only removes impurities and foreign substances, ensuring the purity and safety of the drug, but also has high efficiency in filtering most chemical solutions.

　　

　　In the food industry, the RYF series integrated filters also play an important role. It can filter impurities and foreign substances in various food ingredients such as beverages and alcoholic beverages, ensuring the quality and safety of the products.

　　

　　In the environmental protection industry, the application of RYF series filters can filter impurities such as suspended solids and organic matter in water, ensuring the safety and purity of water quality. This is of great significance for the field of environmental water treatment.

　　

　　In the electroplating industry, the role of RYF series integrated filters cannot be underestimated. During the electroplating process, various waste liquids and wastewater are generated, which require strict filtration and treatment to avoid affecting the environment and production equipment. The RYF series filters can effectively filter and treat these waste liquids and wastewater, ensuring the stability and sustainability of electroplating production.

　　

　　In short, the RYF series one-piece filter is undoubtedly an efficient, durable, and easy to maintain filtering device. It is widely used in industries such as chemical, pharmaceutical, food, and environmental protection to safeguard your production. Choosing our products can not only help you improve production efficiency and reduce costs, but also enhance your business’s competitiveness in the market. If you have any questions or need more information about our products, please feel free to contact us at any time. We will serve you wholeheartedly! At the same time, please follow our official account for more product information and industry information.